畸变电网下基于VPI的GC-VSC控制策略研究  

GC-VSC Control Strategy Under Distorted Grid Conditions Based on VPI

作　　者：田园[1] 罗安[1] 谢宁[1] 张潇[1] 

机构地区：[1]国家电能变换与控制工程技术研究中心湖南大学,湖南长沙410082

出　　处：《电力电子技术》2015年第3期85-87,共3页Power Electronics

基　　金：国家863高技术基金项目(2011AA05A301)~~

摘　　要：在推导含背景谐波电压下电压型并网变换器(GC-VSC)数学模型的基础上,以实现并网电流无谐波分量为控制目标,提出了背景谐波电压下并网逆变器增强运行的控制策略。通过对比例积分(PI)控制器与矢量比例积分(VPI)控制器闭环传递函数的频谱分析进行对比,论证了VPI控制器较PI控制器对谐波电流有更优良的抑制性能。因此为实现对基波及谐波电流的准确控制,在基频同步旋转坐标系下提出了基于VPI电流调节器的控制策略,同时给出该控制器参数设计方法。最后通过实验对所提方法的正确性与可行性进行了验证。On the basis of mathematical model of the grid connected voltage source converter（GC-VSC） under distorted grid voltage, the control scheme of GC-VSC under background harmonic voltage is proposed to achieve no harmonic components in grid side current.That the vector proportional-integral（VPI） controller has better control performance to harmonic current is validated by comparing the spectrum analysis of proportional-integral （PI） controller and VPI con- troller at the harmonic resonance frequency.Therefore, in order to achieve both the fundamental and harmonic current accurate tracking,the VPI current control strategy based on the synchronous rotating coordinate system is proposed. The design method for parameter of the controller is presented.Finally, the experimental results verify the correctness and effectiveness of the proposed control method.

关 键 词：变换器 矢量比例积分 背景谐波电压 

分 类 号：TM46[电气工程—电器]